Commitments And Contingent Liabilities (Regulatory Proceedings and Superstorm Sandy) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended		39 Months Ended	1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2012	Dec. 31, 2013	Mar. 31, 2015	Apr. 30, 2015
Loss Contingencies [Line Items]
Operation and Maintenance	$ (663)	$ (856)
New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program	345				345
Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Proceeds from Insurance Recoveries	159
PSE And G [Member]
Loss Contingencies [Line Items]
Operation and Maintenance	(412)	(462)
PSE And G [Member] | New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program	200				200
Discounted liability recorded-current	86				86
PSE And G [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Utilities, Costs Incurred to Repair Infrastructure to Pre-Storm Conditions			5
Utilities, Costs Incurred to Restore Service portion attributable to insured property			36
Utilities, Costs Incurred to Restore Service			295
Operation and Maintenance	15		(40)
Proceeds from Insurance Recoveries	26		6
Public Utilities, Property, Plant and Equipment, Addition from Service Restore	9		(75)
Regulatory Assets, Addition for Service Restore	8		(180)
Power [Member]
Loss Contingencies [Line Items]
Operation and Maintenance	(172)	(302)
Power [Member] | FERC Compliance [Domain]
Loss Contingencies [Line Items]
Loss Contingency related to bidding errors		25
Power [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Operation and Maintenance	128				(194)
Proceeds from Insurance Recoveries	133			44
Public Utilities, Property, Plant and Equipment, Addition from Service Restore	5
Subsequent Event [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Proceeds from Insurance Recoveries						$ 54